This is why I think they are here --originally posted about a year ago:
It might be useful to think of the phenomenon as some sort of "advanced non-human technology" and avoid the "ET" term altogether. Maybe it is possible that some intelligence found us before we found them; if it is more advanced and within range or was able to detect us somehow, we would be an attractive place to send devices to observe this oasis of life. We have a vast diversity of life that has evolved on this planet and has created so many different biomes and evolved in so many different ways in the midst of large parts of the galaxy that are vacant of life or don't seem to have highly complex life. Perhaps this is the only place within the range of the intelligence, that has life. I think curiosity might be a universal fundament of life, regardless of how or where it develops, and the need to explore and expand might be somewhat universal.
For me, there seems to be certain patterns of behavior that the phenomenon has exhibited over time, and I think that whatever it is, it has been here for a very long time. The "flash and dash" tactics, isolating people or small groups of people in "road encounters", the mass sightings where many are exposed to their displays before they shoot off and leave... Showy maneuvers around weapons testing and nuclear sites... Once you can establish the same type of phenomenon behaving in a controlled manner before we were flying around in the atmosphere --then I think there is no way to put a limit on how far back the phenomenon has been with us. At this point the objects may not be coming in from space on a regular basis, having had ample time to infiltrate the oceans, and other places on the planet, but if I may be allowed to brandish Occam's Razor momentarily, I think it is likely that wherever / whenever they originally came from, it is likely to be physically removed from this planet --even if they are coming from some sort of spacetime portal or something we can't even understand yet. I think the reason the Air Force has been so silent and others whine about sensors being compromised, is because UFOs are seen to be coming in from space periodically, and they seem to be coming in from space in many of the old accounts too; dropping in like shooting stars and then stopping dead in the air and moving off to do their thing. I am further inclined towards this explanation, as with my second sighting the capsule-shaped object / Tic Tac did fly off into space..
. Its more like "we'll make disclosure when Warp Drive is ready".